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Gamers are not averse to first-person shooters—Call of Duty: Modern Warfare 3, for example, earned $1 billion in just over two weeks. But what about when the targets are real, unsuspecting people on the sidewalks rather than cartoon soldiers?

That's the approach taken by Amsterdam-based ad agency Pool Worldwide, which used Google's Street View API to create "Google Shoot View," a game that lets players take aim at those who appear in the street-level, 360-degree images captured by Google's Street View cars.

"Google Shoot View. Explore the world at street-level... and fire a M4A1 assault rifle," Pool Worldwide said in a Dec. 9 tweet announcing the game (preview below).

Google was apparently not thrilled by the idea of having its technology used as the backdrop for a street-level killing spree. The search giant this week pulled Pool's access to its API—the code that allows developers to use the technology.

"Unfortunately, Google has killed the API so at the mo we can't run shoot view," Pool tweeted yesterday.